Question

1. as unspecialized cells mature, what controls their development into specific cell types?

a the rate at which the cells grow
b the genes expressed within the cells
c the nutrients available to the cells
d the age of neighboring cells

Explanation:

Cell differentiation (development into specific cell types) is mainly controlled by gene expression. Different genes are activated or silenced, leading to the production of specific proteins that determine the cell's function and type. The rate of cell growth (A) affects how quickly cells multiply but not their specific type. Nutrients (C) are important for cell survival and general metabolism but not the specific differentiation path. The age of neighboring cells (D) has no direct role in controlling the development of unspecialized cells into specific types.

Answer:

B. The genes expressed within the cells